Year	Percent
1950	11.47642
1955	10.53758
1960	10.41727
1965	12.79705
1970	13.93627
1975	12.49949
1980	9.7651
1985	8.71573
1990	6.86443
1995	6.56699
2000	7.20909
2005	6.79691
2010	6.47256
2015	5.65007
2020	5.08097
2025	4.73561
2030	4.4652
2035	4.27031
2040	4.18337
2045	4.05361
2050	3.91824
2055	3.81936
2060	3.77276
2065	3.76273
2070	3.76869
2075	3.76246
2080	3.73517
2085	3.69764
2090	3.67533
2095	3.65974
2100	3.65106